Rock and like drill



March 18 1924. 1,487,489

.1. STREDA ROCK AND LIKE DRILL Filed Dec. 4, 1922 2 Sheets-Sheet 1 '//7V enfor:

March 1's, 1924. 1,487,489

' J. STREDA 1 Filed Dec. 4, 1922 2 Sheets-Sheet Fetented l8, l

Josnrei srnnn RQCK AND LIKE D1 Application filed December 4-, Serial Ho.Got-.9 21.

wa =3. 9 1 n end or" tl T he feather 3 prevents To all whom 2'25 maycomer rt:

Be it known that I, Josnrrr Sienna, a citi zen of the CzechoslovakianRepublic, residing at London, England, have invented. certainImprovements in Rock and like Drills (for which I have filedapplications in Czechoslovakia on, Octoher 3rd, 1.921; Great Britain,July 25th, 1922; Germany, Septenr her 29th, i922; Ruinania, October 3rd,1922), of which the following is a specilication.

The object of the present invention is to produce a locking lcvicewhereby different screw-joined parts of rock and like t -ills can beeffectively prevented llOfll becoming accidentally detached during thework, and the invention consists in the provision of a cylindrical blockwhich is arranged in a cavity in one ol' the drill parts and which isfeathered to the oth r part so as to be prevented from rotarydisplacement rela tive to the same, the block being divided transverselyinto two parts provided with interntieshing ratchet teeth 'ch allow theupper part of the hloclr to turned into a position in which it can helooked to the surrounding drill part and which prevent relative rotarydisplacement oi the diiierent elements after such locking.

Fig. l of the drawings represents a sectional side view of the device asused for locking the drill to the drill head.

Fig. 2 is an elevation at right angles to Fig. 1,

Fig. 8, a cross-section on the line X--X of Fig. 1,

Fig. 4, an end view on a smaller scale of the upper part of the block,

Fig. 5, a side view 01 the same part,

Fig. 6, a cross-section on the line Y-Y of Fig. 5,

Fig. 7 a side View of the lower part or" the block, and

Fig. 8, a cross-section on the line ZZ of Fig. 7.

The drill B has at one end a conical, screw-threaded plug C whereby itis secured to a corresponding socket formed in the drill head A- Thelatter has a cavity 1 above the plug 0 for the reception of the lockingdevice. This consists of a cylindrical block which is divided,transversely of the axis, into two parts a and b. The lower part isformed with a shoulder 2 and with a feather 3 for the reception of whichcorresponding recesses 4 and 5 are made in the the slot i l of the headA.

and

and 7/ are recessed, any; two recesses =3 and 8 a crown of ratchet teethformed. The eeth 7 of he lower p mesh with if l oi the upper p: butallow alive, right uiul, rotary displzu-cnient o. the two 1. T upper iipart Z) has also a transverse slot 10 through which to admit a lockingoolt e which is passed through. a cor bonding slot in the drill heed it.A g e 9 is turned inside therecess 8 in which to receive the ends of ablade spring 13. This spring curved so as to bear against the bolt 0which accoinniodates the spring in a notch 18. A re ccss 1G is made inthe head A to receive the prismatic bolt head Diainetrically oppositethe recess 16 there is a re if! 1 which to accommodate a split pie (Zwhich secures the bolt 0 in position. is the head 15 and the pin {Z donot project beyond the outer surface oi the l head, the latter will haveno additional elements to hinder "it in its v-Jorlr. The block part b isforn'ied with two circumferential rowsoi drill holes 12 arranged so asto be accessible through Before the drill B is connected to the head A,the block a, Z) is placed in position on the plug C, whereupon thelatter is screwed together with the olocl; into the head A. When a rigidconnection has been i?- obtained, the block part b is adjusted by meansof a wire or nail, inserted through the slot 1 1- into the apertures 12,so as to set the slot 10 in alignment with the slot 14:. The bolt canthen be inserted and fastened by means of the split pin cl, whereuponthe drill B will be effectively locked to the'drill head. As the bolt 0is inserted, the spring 13 snaps into engagement with the notch 18 andwill, while pressing the two parts of the block together, retain thebolt even if the pin cZ should happen to be detached. The slot 10 isslightly elongated to allow for slight diiferencos in the mainconnection and also to permit the upper part b to lock freely with thelower part a.

With a righ -hand screw-thread on the plug 0, the ratchet teeth 7 and 11are set so as to oppose a left-hand movement of the lower block partwhen the upper block is locked to the drill head. If the plug thread isa left-hand one, the block teeth are reversed so as to oppose theright-hand niovenient. W hen all is connected only a slight upwardniovtnient of the part 5 is allowed for so that no appreciable rotarydisplacement of the two block parts can take place in either direction.

It is evident that with the removal of the in d and the bolt 0 the twoscrew-joined arts B and Q are unlocked and can be taken apart in theusual manner.

The device, which is not atl'ected by the blows n the tool, can beeasily litte into z i drill head without heir external shaoe. Althoughwith a drill and a drill t 1 I -.-Y ne aseo. in any other altering shownin C0111 h ad, the device have to be screwed together.

1. A device for locking together two screwjoined parts of a rock or iiis crill, cornprising a cylindrical block divided UHDSVQYSQly into twoparts and fitted in acavity in the female drill part, the lower part ofthe block I being feathered to the male drill part so to be preventedfrom rotary displacement relative to the latter, the adjoining faces ofthe block part being formed with interzneshing ratchet teeth preventingrelative rotation in the unscrewing direction of the drill elements butallowing the top part to be turned in the opposite direction, a headedlock bolt, the top part of the block and the female part of the drillbeing slotted for the reception of said lock bolt, a split pin forfastening the bolt in looking position, the female drill part beingrecessed to accommodate the head and the split pin, a blade spring ttedin the top part or" the block so as to bear against the inserted loci;bolt and press the block parts together, the lock bolt having a notch inwhich to receive the abutting part of the spring, and means for turningthe top part of the block so as to admit the lock bolt after the drillparts have been screwed together.

2. A device for locking together two screwjoined parts or a rock or likedrill, comprising a cylindrical block divided transversely into twoparts and fitted in the cavity or" the female drill part, the lowerblock part being feathered to the male drill part so as to be preventedfrom rotary displacement relative to the latter, the adjoining faces ofthe block parts being formed with interineshing ratchet teeth preventingrelative rotation in the unscrewing direction of the drill elements butallowing the top part to be turned in the opposite direction, a headedloch bolt, the top part or" the block and the female partof the drillbeing slotted for the reception of said lock bolt, a split pin forfastening the bolt in looking position, the female drill part beingrecessed to accommodate the bolt head and the split pin, a blade springfitted in the top part of the block so as to bear against the insertedlock bolt and press the block parts together, the bolt having a notch inwhich to receive the abutting part of the spring, the top part of theblock being provided with holes arranged so that they can be reachedthrough the slot in the female drill part for turning said top part intoposition for adniitting the lock bolt after the drill parts have beenscrewed together.

JOSEPH STREDA.

